#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#define MAX 12
 
typedef struct aluno {
    char nome[40];
    int idade;
} Aluno;
 
typedef struct lista {
    size_t qnt;
    Aluno dados[MAX];
} Lista;
 
Lista* cria() {
    Lista *l = malloc(sizeof(Lista));
    if (l != NULL)
        l->qnt = 0;
        return l;
}
 
int insere(Lista *l, Aluno al) { //insere no inicio
    if (l == NULL)
        return 0;
    if (l->qnt == MAX)
        return 0;
    for(int  i = l->qnt; i > 0; i--) {
        l->dados[i] = l->dados[i - 1];
    }
    memcpy(&l->dados[0], &al, sizeof(Aluno));
    l->qnt++;
    return 1;
}
 
void liberar(Lista *l) {
    free(l);
}
 
void exibe(Lista *l) {
    if (l->qnt == 0) {
        printf("\nLista esta vazia.\n\n");
    }
    for (int i = 0; i < l->qnt; i++) {
        printf("Aluno: %s", l->dados[i].nome);
        printf(", de Idade: %d\n", l->dados[i].idade);
    }
}
 
int main() {
    Lista *l = cria();
    Aluno al;
    int opc;
    do {
	    printf("\tEscolha uma Opcao\n");
	    printf("O: sair\n");
	    printf("1: Cadastrar Aluno\n");
	    printf("2: Exibir Alunos\n");
	    printf("Opcao: ");
	    scanf("%d", &opc);
	    switch(opc) {
	    case 0:
	        break;
	    case 1: //inconsistência
	        printf("\nDigite o nome: ");
	        scanf("%s", al.nome);
	        printf("Digite a idade: ");
	        scanf("%d", &al.idade);
	        insere(l, al);
	        system("cls");
	        break;
	    case 2:
	        exibe(l);
	        break;
	    default:
	        printf("Opcao Invalida.\n");
	        break;
	    }
    } while (opc != 0);
    liberar(l);
}

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1
joao
10
1
jose
20
1
maria
30
2
0